Plano-based Tyler Technologies is making its fifth acquisition of the year — a Canadian firm that created mobile software used by law enforcement agencies.

Terms of Tyler's purchase of Mississauga-based SceneDoc weren't disclosed in the company's announcement Monday. SceneDoc's 18 employees will continue to operate from their current offices in the Toronto suburb.

The company spent just over $173 million in its four earlier acquisitions — Socrata Inc., Sage Data Security, CaseloadPRO and MobileEyes. Socrata was the largest of those deals at $147.6 million, according to regulatory filings. Tyler has made 27 acquisitions since 2006.

Founded in 2011, SceneDoc created technology that allows first responders to use smartphones, tablets, wearables and task-specific apps in the field to capture data, electronic notes and multimedia to the cloud.

"Public safety continues to embrace new approaches and tools which keep officers engaged with their communities, and this aligns well with Tyler's vision for empowering smarter, safer and more vibrant communities," said Lynn Moore, president and chief executive officer of Tyler, in a statement.

Alex Kottoor, co-founder and CEO of SceneDoc, said Tyler's backing gives the company an opportunity "to serve even more law enforcement agencies and their communities" with its field reporting software. Kottoor and co-founder Adrian Bubalo will join Tyler as general managers.

Tyler's key markets, as shown in its November investor presentation.

Tyler bills itself as "the largest software company in the nation solely focused on providing services to the public sector." Its client base includes more than 15,000 local government offices in all 50 states, Canada, the Caribbean, Australia and other international locations.

The fast-growing company's revenue has risen from $134 million in 2002 to a projected $950 million this year. Through the nine months that ended Sept. 30, Tyler's 2018 revenue was up about 11 percent from the previous year.